SU1407775A1 - Device for automatic program control of circular grinding machine - Google Patents

Abstract

The invention relates to mechanical engineering and can be used on circular grinding machines with programmed control, in particular with control from a mini-computer, when processing multistep shafts. The goal is to expand technological capabilities and increase the accuracy of machining parts by increasing the accuracy of positioning of the grinding headstock and the smoothness of feeding at the final stage of stock removal. At the output of the adder 13, a drive drive control signal 12 is generated, taking into account

Description

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feedback on the actual relocation of the grinding headstock 4 from the linear sensor 3. Transducer 1 controls the size of the part. When the allowance to be removed becomes equal to the calculated one, the computational I unit 14 begins to form a cross feed control algorithm for the final cycle based on feedback from the primary converter 1. At this stage, the cross feed speed is proportional to the current allowance value. The input of the adder 10 also comes

the signal from the sensor 5 of the circular movement of the screw 6 for feeding the grinding headstock 4, which is used as an additional feedback sensor. As a result, at the output of the first adder 10, a resultant feed drive control signal 12 is generated, which provides displacement with a resolution equal to that of sensor 5 by a predetermined amount of movement of the grinding wheel 4 over the linear sensor 3 and corresponding to the size of the part 2. 1 il.

The invention relates to a mass-structure and can be used on circularly circular machine tools with programmed control, in particular with control from a minicomputer, when processing multistage shafts.

The aim of the invention is to improve the technological capabilities and improve the accuracy of machining parts such as multistage shafts by increasing the precision of the positioning of the grinding headstock and the smoothness of the cross feed at the final stage of the stock removal.

The drawing shows a block diagram of a device for automatic control of a circular grinding machine with software control.

The device contains a measuring bracket with a primary transducer 1 of part size 2, a linear sensor 3 of the actual movement of the grinding headstock 4, a sensor 5 of circular movement of the screw 6 of the feed of the grinding heads 4 mounted on the primary shaft of the worm gearbox 7, on the other end of which a high torque motor is installed 8, connected in series with the sensor 5, the first communication unit 9, the first adder 10, the functional unit 11 and the feed drive 12. The output of the second adder 13 is connected to the second input of the first accumulator 10, the first input of which is connected to the calculating unit 14 connected to the output of the task unit 15, as well as to the primary converter 1 via the second communication unit 16. The second input of the second adder 13 is connected via a compensation unit 17 connected in series and a third communication unit 18 with a linear sensor 3. The device operates as follows.

At the preliminary stage of the machining of the surface I of the part 2, the control of the cross feed of the grinding headstock 4 is carried out on the basis of information about its position coming from the linear sensor 3 to the second input

5 of the second adder 13 via the third communication link 18 through the compensation block 17, designed to correct the signal of the linear sensor 3 with regard to the data on its error. TO

Q the first input of the second adder 13 receives a signal from the computing unit 14 connected to the control program setting unit 15. At the output of the second adder 13 is formed

5, the main drive control signal of the feed 12, which allows for feedback, according to the actual movement of the grinding headstock 4 from the linear sensor 3, and is fed to the input of the first adder 10 ..

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In the corresponding, specified by the control program, the position of the grinding head 4, the measuring clamp. with the primary converter 1 is inputted to the measuring position, controls the size of the surface I to be processed and outputs a signal about its value through the second communication unit 16 to the input of the computational unit 14. When the programmed intermediate size part 2, i.e. when the allowance to be removed becomes equal to the calculated one, computational block 14 begins to form the transverse feed control algorithm for the automatic processing cycle stage based on feedback from the primary converter 1. Thus, at this stage of the cycle, the transverse feed rate is proportional to the current value guise of allowance.

At the output of the second sugator 13, a resulting error signal is generated based on the signal from the computing unit 14 and on the feedback signal from the linear sensor 3 and, adjusted to the actual discreteness of the sensor 5 by multiplying this signal by the ratio discreteness of sensors 3 and 5, is fed to the input of the first adder 10.

Meanwhile, the second input of the first adder 10 receives a signal through the first communication unit 9 from the sensor 5 of the circular movement of the feed screw of the headboard 4, used as an additional feedback sensor. At the same time, the actual sampling resolution of the sensor 5 is provided 2-10 times less than the sampling resolution of the linear sensor 3 by placing the sensor 5 on the input shaft of the worm gear 7, for example, with a gear ratio of 1: (5-25) connected to the high-torque motor shaft. eight.

Consequently, the inputs of the first adder 10 receive a driver signal for a certain amount of movement of the grinding headstock 4 from the second adder 13, adjusted to the actual resolution of the sensor 5, and the signal from the sensor 5 through the first communication unit 9.

As a result, at the output of the first adder 10, the resulting control signal of the feed drive 12 is generated, which provides displacement with a resolution equal to that of the sensor 5 by a predetermined amount of movement of the grinding headstock 4 along a linear

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sensor 3 and the corresponding count-. on the transducer 1 part size 2.

The functional block 11 is designed to convert the discrete signal mismatch or analog with certain characteristics corresponding to the specific execution of the feed drive 12 and, in addition, to ensure an increase in the gain in the lower part of the range of movement speeds of the pinch head 4.

Upon reaching the specified size of the processed surface I, on the basis of the information of the primary converter 1, the computing unit 14 forms a command to reverse the high-torque motor 8. As a result, the grinding headstock 4 is retracted. At the moment of reaching the size of the part 2, in addition, the computing unit 14 determines the amount of correction K X - R (where X is the position of the grinding head 4 measured by the linear sensor 3, R is the radius of the part 2 measured by the primary sensor 1) grinding wheelhead 4 in accordance with the actual size of the part 2, which eliminates the size error caused by the displacement of the cutting surface of the wheel due to the force, heat movement of the spindle, wear of the grinding wheel and tool for editing And post -.yubrabot- ke surface parts 2 II.

Consequently, the device can be used not only for npif surface treatment of the part using active size control using measuring transducer 1, but also with increased requirements for dimensional accuracy in cases where the use of measuring transducer 1 is impossible, which expands its technological capabilities. The device also provides the exception of errors of the follower feed drive, since the sensor 5, installed on the same shaft with the high-torque motor 8 and therefore having a small discreteness, determines the dynamic characteristics of the feed drive 12, thus the sensitivity and smoothness of movements, and the linear sensor 3 controls the testing of a given amount of movement and

1 | the sleepy position of the grinding woman and 4. Due to the smoothness of the movement of the grinding wheelhead 4 at the end of the processing cycle, directly accomplished by reaching the specified size, the accuracy of the geometric shape and the quality of the machined surface are increased.

During the subsequent processing of the surface II of part 2, the use of the ak-f HBHoro control of the current size of which with the help of the primary transformer: (engine 1 is not possible, for example, due to the presence of grooves on it, at the preliminary stage of the processing cycle, drive control of the grinding head 2 4 is made according to the sequence shown.

Then, when the intermediate position of the grinding headstock, as specified by the control program, is reached, the computing unit 14 begins to form the cross feed control algorithm for the final stage of the grinding cycle. On the basis of this control algorithm and feedback on the actual displaced 1 on grinding head 4 from the linear sensor 3, the second adder 13 forms the resulting control signal at 1UDM 12 supply, and its speed; 1 is proportional to the current value of uSd), determined as dSC T) t S. - SC), where 5c is the final one, which is taken into account in the previous processing, refinement, position of the grain of the tailstock 4, corresponding to the specified surface size of the II part 2; S (t) is the current position of the grinding headstock 4 in the final processing cycle, measured lio linear sensor 3.

The subsequent arrival of the signals of the second adder 13 and from the sensor 5 to the first adder 10, as well as the formation of the error signal arriving at the functional unit (1 and further to the feed drive 12,

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It exists as described for surface I.

At the time of reaching the coordinate S of the grinding headstock 4, corresponding to a given size of surface II, the grinding heads 4 are retracted by a command from the computing unit 14.

Subsequently, during mortise and longitudinal grinding of the remaining surfaces of the part 2, depending on whether they are polished with or without active size control, the control proceeds according to one of the described options.

Claims (1)

Invention Formula A device for automatic control of a computer-controlled circular grinding machine, including a measuring clamp with a primary converter, a first adder, a functional unit whose output is connected to the drive of the lateral feeding of the grinding headstock, a linear displacement sensor of the grinding headstock, a task block and a calculating unit that differs from which, in order to expand technological opportunities. the ability and accuracy of processing, the device is equipped with an additional sensor for circular movement of the screw of the cross feed mechanism of the grinding headstock, connected via the first communication unit to the first adder, the output of which is connected to the functional unit, the primary converter is connected to the computing unit through the input second communication unit whose input is also connected to the output of the task block, and the output to the input of the entered second an adder, the output of which is connected to the input of the first adder, a linear sensor for displacing the grinding head through the third communication unit connected in series and the unit compensation is associated with the input of the second adder. Subscription